Projector.



Hl A. DOUGLAS. PROJECTOR.

APPLICATION FILED DEC. 5, 19H1'- 1,291,444.

Patented Jan. 14, 1919.

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tmTTnn sTaTEs PATENT ernten.

HARRY A. DOUGLAS, or BRoNsoN, MICHIGAN, ASSIGNOR To DOUGLAS co., or BRoNsoN, MICHIGAN.

@c RUDD MFG'. A CORPORATION OF MICHIGAN.

PROJECTOR.

1,291,444' Specification of Letters Patent.

Patented Jan. 14,1919.

Application filed December 5, 1916.

[o all /r/mm it may concern:

lie it known that l. l'lAnny DoroLAS, citizen of the `llnited States, residing at Bronson, in the county of Branch and State of Michigan, have invented a certain new and useful improvement in Projectors, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to reflecting lamps employing dish-shaped casing and dishshaped reflectors surroluided thereby, the reflecting surfaces being usually parabolic.

My invention has for one of its objects the provision -of an improved mounting for a lighting element in front of the rear part of the reflector, and which mounting (a connector shell) extends backwaldly to be aC- ccssible at the rear of the casing and has means for the purpose of adjusting the focus or lighting center of the lamp with respect to the reflector.

rlhe invention has for another ot' its 0biects the provision of an improved assembly between the reflector and the casing therefor at the forward portions of these two elements ot' the lamp structure.

The invention has for its third object. the provision of an improved means for niouiti.- ing the light transmitting `closure that is provided'at the forward end of the lamp structure.

My invention, in all of its aspects. will be pointed out in the claim and will be fully described in connection with the accon1panying drawing showing the preferred embodiment of the invention and in which Figure 1 is a view in longitudinal sectional elevation; Fig. 2 is a view on line 2-2 of' Fig. 1; Fig. 3 is a view showing the preferred formation of the central portion of the reflector' shell; Fig. 4 is a top plan view of a part of the structure shown in Fig. 1 with a portion broken away; Fig. 5 is a view of an abutment which preferably' enters into the construction; Fig. (i shows' a modification of the structure illustrated at the lower portion of Fig. 1 and in Fig. i; and Fig. 7 is a bottom View of a part of the structureshown in Fig. 6 with a portion broken away.

Like parts are indicated by similar characters of reference throughout the different figures.'

The concave casing and the concave re- Serial No. 135,117.

flector shell 2 that projects Into the casings are coupled at the forward end of the lamp structure, in accordance with the preferred embodiment of the invention. The means b v which the coupling between the elements 1 and 2 of the lamp is effected are desirably in the Vform of a plurality o f bayonet catches 3 distributed around and carried by one of the elements, preferably the casing 1, these bayonet catches operating as will hereinafter appear.

ln the construction shown in Figs. 1 and -t the bayonet catches 3 project through bayonet slots i provided in the rear Continuation 5 of a retaining ring 7 which operates to hold thel casing and refiector shell together and which retaining ring is desirably curled over to conceals the projecting ends of the bayonet catches. The reflector shell 2 is desirably provided with a. surrounding flange 9 integrally formed therewith and which fiange is provided with an annular groove 10 that receives the packing cord 11. The light transmitting closure .l2 is held against the packing cord 11 fat the front of the refiector by means of the retaining ring 7. When it is desired to remove the closure 12 and t0 separate the casing and reflector the retaining ring 7 is merely turned until the bayonet catches Si are disengaget't from the bayonet slots -t to permit the retaining ring to be re. moved. Vln the. construction shown in Figs. o and 7 the bayonet catches 3 are provided upon the reflector shell and engage bayonet slots t1 that are provided in the casing, this casing heilig form a hollow bead 8 that I backwardly curled as indicated at 1 1 to form a hollow bead that conceals the construction shown in Figs. 6 and 7 the re` i flector shell and back element are directly coupled by means of the bayonet catches 31 and the bayonet slots 11, but in the construction of Figs. l and -t the casing and refiector shell are not directly coupled, the spring 18 operating to press the casing 1 and thereflector shell 2 apart at the rear portions of these elements, the spring 18 thus operating to hold the reflector shell and glass 'l2 against the retaining ring 7, the retaining ring in turn coupling the forward ends of the reflector shell and casing.

The circuit connector shell is provided at its front and rear end with means for f whereby not only will the adjusting sleeve attaching thereto circuit continuing devices, a lamp bulb being receivable at the forward end of the- .ronnector shell 15 and a plug at. the rear end of the connector shell. The connector shell 15 has a threaded `torn'iation thereupon as indicated at 1G, the threads at 1t being desir-ably 'formed upon an enlargen'ient ot the shell which may be in thenature et a separately termed collar that is rigidly attached to the connector shell to torni an integral or fixed part thereot. The threads 1G upon the connector shell have threaded engagement with a` sleeve 17 carried by the casino. rlhis sleeve 17 is desirably tubular, the connector shell 15 passing through the bore of the sleeve 17 to be accessible at the rear oit the sleeve 17 for attachment thereto of a circuit continuing plug. Spacing intervenes between the forward end et' the tubular adjusting sleeve 17 and the connector shell 15 t'or the reception ot the rear end of the compression springr 18 whose torward end bears agaimst the rear end ot' the reflector shell 2. rThe rear end ot' the reflector shell is provided with an opening 19in which the forward end of the connector shell 15 may move longitudinally et' the agx'is or" the lamp, the reflector shell carrying a tongue 2O that enters the slot 21 termed in the connector shell 15 to prevent rotation of this connec- D tor shell 15. The tubular adjusting sleeve 17 has a tlangeQZ formed therein that engages the rear et the casing 1, the spring 18 maintaining the flange' or enlargement 22 in engagement with the inner surface of the casing through the intermediation ot the collar 1G and the threaded engagement ot' this collar 1G with the adjusting sleeve 17v that is movable longitudinally of the lamp axis. ln assembling` the structure the tubular adjusting sleeve 17 is slipped rearwardly through the openingprovided at the rear ot the casing, longitudinally of the lamp axis., the flange 22 limiti-ng the extent to which. the sleeve 17 may be moved rearwardly and to maintainthe sleeve in a fixed plane ot' rotation and in assembly with ae casing. When it is desired to adjust the lighting center or element 23 (which may be in the form oli a filament within the lamp bulb 2li) the adjusting sleeve 17 is turned le the right or let't according to the direction in which the lamp bulb is to be moved, and inasmuch as the connector shell 15 cannot be turned owing to the engagement of the tongue 2O in the slot 21 in the shell 15, the shell, 15 must be moved backward or forward according to the direction of rotation otl the adjusting sleeve 17, the spring 1S operating at all times tol maintain the flange 222 in engagement with the casing 1 17 be prevented Yfrom shitting its position longitudinally ot the axis ot the lamp portion but whereby also the adjustment of the lamp bulb el'lected by the rotation of the sleeve 17 will be maintained.

Claims relating to the construction and assembly ot' the casing, light transmitting closure rcl'lcctor shell, retaining ring, and other parts at the trent o'tl the lamp structure will be included in a division ot' this application.'

`lVhile l have herein shown and particularly described the preterred embodiment of my invention I do not wish to be limited to the precise details of construction shown as changes may readily be made without departing from the spirit ot my inventioin but having thus described my invention l cl ,im as new and desire to secure by Letters l/attnt the following:- j

A lamp including ay concave casing; a

concave reflector shell projecting ,into the casing, there being space between the rear ends or' said casing and shell; a connector shell extending between the rear ends ot the casing` and rellector shell; a, lamp bulb within the retlector shell and attached to the t'orward end ot' the connector shell; a rotatable adjusting sleeve, slipped rearwardly i through an opening which is formed in the rear end of the casing and lniving an enlargement engaging the inner surface of said casing to limit thc extent to which lthe sleeve may he moved rearwardly and operatingto maintain the sleeve in a fixed j )lane ot' rotation; means yior preventing rotation ol the coniiector shell and permitting longitudinal movement thereo't' to adjust the lamp bulb in or out7 said connector shell being surrounded by the adjusting sleeve and in threaded engagement therewith to have in. and out movement ot the connector Shell and the lamp bullrett'eeted when the adjusting sleeve is rotated and a spring engaging the rear end ot' the reflector shell and exerting rearward pressure upon the adj listing sleeve to maintain engagement betweeirthe enlargement on the sleeve and the casing.

n witness whcreot, l hereunto subscribe my name this (3th day of Noven'iber, fr. 1916.

HARRY A. ltllllllntrt W'itnesses l-lnnnv C. llownnn, WILL M. Fosrnn. 

